function th=rotateticklabel(h,rot,fontSize)
%ROTATETICKLABEL rotates tick labels
%   TH=ROTATETICKLABEL(H,ROT,FONTSIZE) is the calling form where H is a handle to
%   the axis that contains the XTickLabels that are to be rotated. ROT is
%   an optional parameter that specifies the angle of rotation. The default
%   angle is 90. TH is a handle to the text objects created. For long
%   strings such as those produced by datetick, you may have to adjust the
%   position of the axes so the labels don't get cut off.
%
%   Of course, GCA can be substituted for H if desired.
%
%   TH=ROTATETICKLABEL([],[],'demo') shows a demo figure.
%
%   Known deficiencies: if tick labels are raised to a power, the power
%   will be lost after rotation.
%
%   See also datetick.

%   Written Oct 14, 2005 by Andy Bliss
%   Copyright 2005 by Andy Bliss

%DEMO:
% if nargin==3
%     x=[now-.7 now-.3 now];
%     y=[20 35 15];
%     figure
%     plot(x,y,'.-')
%     datetick('x',0,'keepticks')
%     h=gca;
%     set(h,'position',[0.13 0.35 0.775 0.55])
%     rot=90;
% end

%set the default rotation if user doesn't specify
if nargin==1
    rot=90;
end
if nargin==2
    fontSize = 10;
end
%make sure the rotation is in the range 0:360 (brute force method)
while rot>360
    rot=rot-360;
end
while rot<0
    rot=rot+360;
end
%get current tick labels
a=get(h,'XTickLabel');
%erase current tick labels from figure
set(h,'XTickLabel',[]);
%get tick label positions
b=get(h,'XTick');
c=get(h,'YTick');
%make new tick labels
if rot<180
    th=text(b,repmat(c(1)-.2*(c(2)-c(1)),length(b),1),a,'HorizontalAlignment','right','rotation',rot, 'FontSize', fontSize);
else
    th=text(b,repmat(c(1)-.2*(c(2)-c(1)),length(b),1),a,'HorizontalAlignment','left','rotation',rot, 'FontSize', fontSize);
end

